Fluid pressure brake



-Nov. 5, 1935. A. BAKER 2,020,229

FLUID PRES SURE BRAKE Filed Aug. 20, 1951 15. L. ,Ba dfer;

Patented Nov. 5, 1935 UNITED STATES PATENT OFFICE Claims.

My invention relates to brakes, more particularly to fluid pressurebrakes of the kind commonly known as air brakes, and it consists of thecombinations, constructions, and arrangements herein shown anddescribed.

The primary purpose of my invention is to provide a brake of the fluidpressure' type which utilizes a minimum number of parts to accomplishits functions and which, because of the use of said small number ofparts leading to a compact structure, is adapted to be utilized in anydevice requiring a braking action, such as a vehicle, as an automobile,street car, railway car, or a stationary machine of types too common tomention.

A further object of my invention is to provide a device of the typedescribed that is easily taken down and set up for facilitating repairsthereto and replacement of parts.

A still further object of my invention is to provide a device of thetype described which is adapted for connection to any source of fluidpressure supply.

A yet further object of my invention is to provide a device of the typedescribed which is simple to manufacture and does not get out of ordereasily.

Other objects and advantages will appear as the specification proceedsand the device will be more particularly defined in the appended claims.

My invention is illustrated in the accompanying drawing forming a partof this application, in which Figure 1 is a sectional View of my devicewith parts thereof shown in elevation for clearness of illustration, and

Figure 2 is a side elevational view of my device.

In this embodiment of my idea, I show the same as adapted to stop therotation of an ordinary shaft, I. In carrying out my invention inconnection with this shaft the same is provided with a key slot 2.Fixedly mounted on this shaft by means of keys 3, positioned in thekeyway 2, are friction disks 4, which may have their inner surfaces 5roughened or coated with a friction material, (not shown) if desired.They have curvilinear outer edges, 6, as can readily be discerned froman examination of Figure 1. These members constitute one of the portionsof my brake.

For engagement with the inner surfaces of these friction disks, 4, forstopping rotation thereof and consequently stopping the rotation ofshaft I when desired, I provide a pair of annular members, 1 and 8,telescopically engaged as indicated at 9, for relative axial movement toone another, and provided with friction surfaces; In, on their outerwalls by means of fasteners These members are connected by means of thestud bolts or similar fasteners I2, to the annular 5 housing members l3and i4, this connection making the housing members l3 and I4substantially integral with the members 1 and 8 respectively. Themembers I3 and It also telescopically engage with one another asindicated at I5 and I6. 10 They are mounted in position by means ofthestationarily positioned shafts l1 and I8, engageable through thetelescoping portions I5 and I6. They are further normally urged inwardlytowards one another by the resilient means, consisting of the springs l9and 20.

For moving the members 1 and 8 outwardly to bring their frictionalsurfaces l0 into engagement with the friction walls 5 of the members 4,to stop the rotation 01' the shaft, an expansible member 2|, not unlikethe inner tube of an automobile tire, is encased within said members. Itmay be constructed of rubber or any other suitable material adapted tocarry out the functions necessary for the operation of my device. It isequipped with a fluid inlet and outlet, 22, having a valve thereinsubstantially similar to the valve of an inner tube. This member 22projects through an aperture 23 in the member 8, so positioned thatinterference of the edge of the memher I therewith does not occur.

From the foregoing description, the use and operation of my device iseasily understood. The apparatus is set up as just described, the boltconnections between the members 1 and 8, and I3 and M, respectively,allowing assembly and disassembly of the parts.

When it is desiredto operate the brake, fluid is admitted through themember 22 to the expansible member 2| from a source of fluid supply byany suitable fluid control means (not shown) desired, the desiredbraking pressure being regulated by this fluid control means. It caneasily be understood that expansion of the member 2| will force themembers and 8 outwardly to engage with the disks 4 to stop the rotationof the shaft I.

When it is desired to permit rotation of the shaft it is only necessaryto release the pressure in the expansible member 2| by the fluid controlmeans, and the parts will be retracted into the inoperative position bymeans of the springs l9 and 20.

It can easily be understood from the description of the parts that theexpansible member will be well encased in the telescoping members duringall periods of operation, so that protection of the same will beassured.

It is thus seen that I have provided a brake that is well adapted tostop the rotation of any desired shaft without modification thereof;that is compact and consists of a limited number of parts; that canreadily be assembled and disassembled for repair and replacement ofparts, and that is so adapted to contain the part that is most subjectto deterioration, namely, the expansible member, that said expansiblemember will be afforded the greatest possible protection.

What I desire to claim and secure by Letters Patent is:

i. In combination with a rotatable member, friction members rotatablewith said member, cooperating friction members telescopically engagedwith one another, a housing comprising a pair of telescopically engagingportions each of which portions is attached to one of the second-namedfriction members, and fluid pressure means for forcing the second-namedfriction members into cooperating engagement with the first-namedfriction members.

2. In combination with a rotatable member, friction members rotatablewith said member, cooperating friction members telescopically engagedwith one another, and fixedly positioned against rotation relative tosaid first-named friction members and within said friction members, ahousing attached to the second-named friction members, said housinghaving parts telescopically engageable with each other, and fluidpressure means for forcing the second-named friction members intocooperating engagement with the first-named friction members.

3. In combination with a rotatable member, friction members rotatablewith said member, cooperating friction members telescopically engagedwith one another, a housing attached to the second-named frictionmembers, said housing having parts telescopically engageable with eachother, resilient means attached to said housing to normally urge saidhousing parts into juxtaposi- 5 tion and fluid pressure means forforcing the second-named frictionmembers into cooperating engagementwith the first-named friction members.

4. A brake comprising a pair of friction mem- 1 bers for movement withthe member to be stopped,

a second pair of friction members telescopically engaged with oneanother and fixedly positioned against rotation relative to saidfirst-named pair of friction members, a housing attached to the 15second-named friction members, said housing having parts telescopicallyengageable with each other, an expansible member positioned within andbetween the second named pair of friction members, means for supplyingfluid pressure to 20 said expansible member for moving the secondnamedpair of friction members into engagement with the first-named pair offriction members for stopping the movable member, and resilient meansattached to said housing for withdrawing 5 said second-named pair ofmembers from the first-named pair of members upon release of pressure inthe fluid system.

5. In combination with a rotatable member, friction members rotatablewith said member, 30 cooperating friction members positioned within saidfirst named members and non-rotatable relative thereto, housing memberstelescopically engaged with one another, connected to said second namedmembers and extending about said 35 first named members, and means forforcing said second named members into engagement with said first namedmembers.

ARTHUR L. BAKER. 40

